CN108827999A - The evaluation method of low porosity permeability sandstone reservoir moveable oil ratio and moveable oil stock number - Google Patents
The evaluation method of low porosity permeability sandstone reservoir moveable oil ratio and moveable oil stock number Download PDFInfo
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Abstract
The invention discloses low porosity permeability sandstone reservoir moveable oil ratio and the evaluation methods of moveable oil stock number, include the following steps：(A) the oil-gas geology data of evaluation area's target zone are obtained；(B) it is sampled in evaluation area target zone different depth, obtains at least two pieces of core samples, measure the porosity and permeability of the core sample；(C) low porosity permeability sandstone reservoir moveable oil ratio evaluation method is used, core sample moveable oil ratio is measured；(D) relation formula of three is established according to the porosity of core sample, permeability, moveable oil ratio, and calculates reservoir moveable oil ratio；(E) the moveable oil stock number of evaluation area's target zone is calculated according to reservoir moveable oil ratio.The calculation method of moveable oil ratio provided by the invention, without considering T2Relaxation time cutoff value is the nuclear magnetic resonance T according to core sample before displacement and after displacement2The variation of spectrum, is calculated moveable oil ratio, and this method reliability is higher.
Description
Technical field
The present invention relates to petroleum natural gas exploration fields, and in particular to low porosity permeability sandstone reservoir moveable oil ratio and
The evaluation method of moveable oil stock number.
Background technique
The 63.5% of China's oil oil in place is distributed in hypotonic and ultra-permeable reservior, in addition, having low porosity permeability feature
Fine and close oil gas also have become global Oil Gas supply important component.Low permeability sandstone reservoir physical property is poor, hole and larynx
Road is fine, and wherein the seepage flow characteristics of fluid are different from conventional reservoir, and a big chunk fluid is by capillary force and adhesive tape power institute beam
Seepage flow cannot be participated in by tiing up.Only those can participate in the oil namely moveable oil of seepage flow in low porosity permeability sandstone reservoir, just have exploration
And Development volue.
It is the bridge that oil-gas geology stock number is converted to mining resources amount that coefficient, which can be adopted,.In oil and gas resource evaluation and finimeter
In calculation, adopt coefficient of the empirical value as a certain oil reservoir of an oil field or block is usually chosen, it is calculated accordingly
Mining resources amount is unfavorable for the exploitation to petroleum resources there are biggish uncertainty.Cui Jingwei etc. thinks Chinese fine and close oil ground
Matter reserves are more than 100 × 108T, but determine that mining resources amount difficulty is larger.As it can be seen that clear moveable oil scale parameter and moveable oil
Stock number by for the selection of coefficient, final recverable oil gas stock number can be adopted determination and evaluating reservoir important evidence is provided.
Currently, the research about sandstone reservoir moveable oil is concentrated mainly on mobility Dominated Factors, movable oil distribution and can
Dynamic oil saturation degree etc., rarely has and is related to the research of low porosity permeability sandstone reservoir moveable oil RESERVE EVALUATION method.The bases such as Cui Jingwei
Gu calculating fine and close oil sands absorption oil mass and free oil mass in stream-action model, the limit mining resources of fine and close oil have been obtained
Amount；And establish be related to the fine and close oil of 5 experiments and more than 10 parameters can momentum evaluation method.Dai Quanqi etc. is in Publication No.
A kind of method and device for calculating fine and close oily reservoir porosity, this method are provided in the application for a patent for invention of CN105866009A
According to centrifugation rock sample nuclear magnetic resonance T2Relaxation time cutoff value obtains the effective saturation degree of movable fluid.
But above method is related to sandstone active porosity specific surface area, quality of adsorption coefficient and nuclear magnetic resonance T2When relaxation
Between the micro-parameters such as cutoff value, however, the heterogeneity of sandstone reservoir, determines different sandstone intervals or different zones sandstone
Such micro-parameter there are larger differences, under prior art conditions, be not easy obtain can represent on entire interval or region
Sandstone reservoir such micro-parameter.In addition, the experiment and parameter that this method is related to are excessive, and just for fine and close oil, can grasp
Make and practicability is subject to certain restrictions.
It is current urgently to be solved one in conclusion how effectively to evaluate low porosity permeability sandstone reservoir moveable oil stock number
Item technical problem.
Summary of the invention
The object of the present invention is to provide the evaluations of low porosity permeability sandstone reservoir moveable oil ratio and moveable oil stock number
Method is difficult to characterize the spy of the heterogeneous sandstone reservoir on entire interval or region to solve micro-parameter of the existing technology
Sign and the experiment that is related to of the prior art, parameter are more, but application range is narrow, operability and the not high problem of practicability.
The present invention is achieved through the following technical solutions：
Low porosity permeability sandstone reservoir moveable oil ratio evaluation method, the moveable oil ratio are calculated according to following formula：
Pm=(Abd-Aad)/Abd
Wherein, PmFor moveable oil ratio, AbdFor the nuclear magnetic resonance T before core sample displacement2The integral area of spectrum, AadFor rock
Nuclear magnetic resonance T after heart sample displacement2The integral area of spectrum；The AbdPass through the nuclear magnetic resonance T before measurement core sample displacement2
Spectrum obtains, the AadPass through the nuclear magnetic resonance T after measurement core sample displacement2Spectrum obtains；The core sample samples self-evaluation
Area's target zone.
In the prior art, about the evaluation method of the moveable oil stock number of low porosity permeability sandstone reservoir, there are problems.It is first
It is first, although Gu Cui Jingwei et al., which is based on stream-action model, calculates fine and close oil sands absorption oil mass and free oil mass, obtain cause
The limit mining resources amount of close oil, but the experiment that is related to of this method and parameter are excessive, it is big not only to implement difficulty, but also respectively join
Number can bring error, and error accumulation caused by excessive parameter, which will lead to evaluation result, not to be inconsistent with actual conditions；Secondly,
The fine and close oily reservoir effecive porosity of the calculating that Dai Quanqi et al. is proposed in the patent application of Publication No. CN105866009A
Method is mainly according to centrifugation rock sample nuclear magnetic resonance T2Relaxation time cutoff value obtains the effective saturation degree of movable fluid, however, sand
The heterogeneity of rock reservoir determines the T of different sandstone intervals or different zones sandstone2There are larger for relaxation time cutoff value
Difference, with nuclear magnetic resonance T2The error that relaxation time cutoff value calculate generation is larger, and the reliability for analyzing result is low；It is practical
On, nuclear magnetic resonance T is mainly based upon to the evaluation of moveable gel in the prior art2Relaxation time cutoff value calculates,
In another example solving big et al. the T using 16ms as movable fluid with constraint fluid2Relaxation time cutoff value, nuclear magnetic resonance T2In spectrum
T2The sum of the amplitude that relaxation time is greater than 16ms each point accounts for nuclear magnetic resonance T2The percentage of all the points amplitude sum is composed as movable fluid
Saturation degree.But different regions, different layers position, different lithology stratum T2Relaxation time cutoff value is different and obtains difficulty
Greatly, it is typically in the range of between 1~100ms, so that such method is difficult to be widely applied since accuracy is low.
In order to solve the problems in the prior art, the present invention provides a kind of moveable oil ratio evaluation of low porosity permeability sandstone reservoir
Method, and the moveable oil stock number for evaluating area's target zone is from which further followed that using the moveable oil ratio evaluation method.
Specifically, about low porosity permeability sandstone reservoir moveable oil ratio evaluation method, first area to be evaluated target zone into
Row samples, the core sample standard sample that acquired sample is sized to, later washing oil, drying；Again to core sample
Product carry out displacement test, and measure nuclear magnetic resonance T of the core sample before displacement and after displacement2Spectrum；Finally according to core sample
Before displacement and displacement after nuclear magnetic resonance T2The variation of spectrum obtains core sample moveable oil ratio.
The calculation formula of the moveable oil ratio of core sample is Pm=(Abd-Aad)/Abd, wherein PmIt is single for moveable oil ratio
Position is %；AbdNuclear magnetic resonance T before indicating core sample displacement2The integral area of spectrum, dimensionless；AadAfter core sample displacement
Nuclear magnetic resonance T2The integral area of spectrum, dimensionless.
The moveable oil ratio that a certain low porosity permeability sandstone reservoir can be obtained by the above method and formula, in conjunction with this area
Oil-gas geology data can calculate the moveable oil stock number of a certain low porosity permeability sandstone reservoir in this area.The moveable oil ratio is commented
Valence method is not related to nuclear magnetic resonance T2Relaxation time cutoff value is the nuclear-magnetism by calculating core sample before displacement and after displacement
Resonate T2The variable quantity of spectrum obtains moveable oil ratio, this experiment is related to that parameter is few, and experiment is simple, the moveable oil ratio being calculated
The reliability of example is higher.
Further, the nuclear magnetic resonance T before core sample displacement and after displacement2The determination step of spectrum includes：
Pressurization keeps core sample saturation simulation oily, to measure nuclear magnetic resonance T before core sample displacement2Spectrum；
Core sample is set to be saturated manganese water for simulation oil with manganese water drive, to measure the nuclear magnetic resonance T after core sample displacement2
Spectrum.
The displacement test the specific steps are washing oil after standard sample is made in core sample and is dried, then to core sample
It is vacuumized.Pressurization later is so that core sample saturation simulation oil, it is preferable that the density of the simulation oil is 820kg/m3,
Viscosity at 40 DEG C is 4.9mm2/s.NMR signal of the core sample under saturation simulation oil condition is measured, can be obtained
To nuclear magnetic resonance T of the core sample before displacement2Spectrum；Later under displacement pressure, simulation oil is replaced with manganese water drive, so that core sample
Product are saturated manganese water, measure core sample in the NMR signal being saturated under manganese water state, core sample can be obtained in displacement
Nuclear magnetic resonance T afterwards2Spectrum.
As a preferred embodiment of displacement test, for the Mn in the manganese water of displacement simulation oil2+Concentration is greater than
20000ppm.The program is capable of the nuclear magnetic signal of proton preferably in shield water, it is ensured that the nuclear magnetic resonance T2Spectrum derives from
The NMR signal of simulation oil.
The present invention also provides a kind of evaluation methods of low porosity permeability sandstone reservoir moveable oil stock number, include the following steps：
(A) the oil-gas geology data of evaluation area's target zone are obtained, the oil-gas geology data include that oil area, reservoir have
Imitate thickness, reservoir porosity, reservoir permeability, oil saturation, oil density and oil volume factor；
(B) it is sampled in evaluation area target zone different depth, obtains at least two pieces of core samples, measure the core sample
The porosity and permeability of product；
(C) using any one low porosity permeability sandstone reservoir moveable oil ratio evaluation method above, measurement core sample is movable
Oily ratio；
(D) relation formula of three is established according to the porosity of core sample, permeability, moveable oil ratio, and by reservoir
Porosity, reservoir permeability bring relation formula into and reservoir moveable oil ratio are calculated；
(E) the moveable oil stock number of evaluation area's target zone is calculated according to reservoir moveable oil ratio.
By the oil-gas geology the data such as oil area, reservoir effective thickness, reservoir pore space that obtain evaluation area's target zone
The common reservoir macroparameter such as degree and reservoir permeability can calculate the geological resources of evaluation area's target zone.Later, exist
The different depth of evaluation area's target zone is sampled, and at least two pieces of core samples is obtained, after standard sample is made in each core sample
Carry out washing oil, drying and the porosity and permeability for measuring each core sample.Then, any one previously described rock core is utilized
The evaluation method of sample moveable oil ratio calculates the moveable oil ratio of each core sample.Later, it is carried out using Matlab software
Data analysis, fits the relation formula of moveable oil ratio and porosity, permeability, certainly, those skilled in the art should manage
Solution can carry out displacement test to more core samples to improve fitting precision and then improve precision of analysis,
But experimental cost is increase accordingly, and therefore, can be selected according to the actual situation.Then, by the reservoir hole in oil-gas geology data
Porosity and reservoir pore space rate, which are brought into the relation formula fitted, calculates reservoir moveable oil ratio, finally according to reservoir moveable oil
Ratio and oil-gas geology data calculate the moveable oil stock number of evaluation area's target zone.
To sum up, moveable oil RESERVE EVALUATION method provided by the present invention can be based on core sample before displacement and displacement
Nuclear magnetic resonance T afterwards2The variation of spectrum directly passes through common reservoir macroparameter：Reservoir porosity and reservoir permeability calculate
Reservoir moveable oil ratio is obtained, and moveable oil stock number is calculated in turn, artificial interference factor is small, and parameter is few, and error is less；
Meanwhile core sample quantity collected can be adjusted according to actual needs, experimental cost, experimental period are controllable.
Further, the moveable oil stock number is calculated according to following formula：
Qm=S × H × Ф × So×ρo×Bo×Pm
Wherein, QmIndicate moveable oil stock number, S indicates oil area, and H indicates that reservoir effective thickness, Ф indicate reservoir hole
Porosity, SoIndicate oil saturation, ρoIndicate oil density, BoIndicate oil volume factor, PmIndicate moveable oil ratio.Pass through
The oil-gas geology data that will acquire and the reservoir moveable oil ratio being calculated bring that can calculate in above-mentioned formula can into
Dynamic oil stock number.
Compared with prior art, the present invention having the following advantages and benefits：
1, the calculation method of moveable oil ratio provided by the invention, without considering nuclear magnetic resonance T2Relaxation time cutoff value,
It is the nuclear magnetic resonance T according to core sample before displacement and after displacement2Moveable oil ratio, this method is calculated in the variation of spectrum
Reliability is higher；
2, moveable oil RESERVE EVALUATION method provided by the present invention can be based on reservoir moveable oil ratio, directly by normal
Reservoir macroparameter, is calculated moveable oil stock number, and this method operability is higher；
3, the present invention not only can be for fine and close oil, additionally it is possible to be widely used in the moveable oil resource of low porosity permeability sandstone reservoir
Amount evaluation, has extensive promotional value.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is the flow chart of low porosity permeability sandstone reservoir moveable oil RESERVE EVALUATION method in the specific embodiment of the invention；
Fig. 2 is nuclear magnetic resonance T of each core sample before displacement and after displacement in the specific embodiment of the invention2Spectrum；
Fig. 3 is the relational graph of the moveable oil ratio of core sample and porosity, permeability in the specific embodiment of the invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to embodiment and attached drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation for explaining only the invention, are not made
For limitation of the invention.
Embodiment 1：
Low porosity permeability sandstone reservoir moveable oil ratio evaluation method, the moveable oil ratio are calculated according to following formula：
Pm=(Abd-Aad)/Abd
Wherein, PmFor moveable oil ratio, AbdFor the nuclear magnetic resonance T before core sample displacement2The integral area of spectrum, AadFor rock
Nuclear magnetic resonance T after heart sample displacement2The integral area of spectrum；
The AbdPass through the nuclear magnetic resonance T before measurement core sample displacement2Spectrum obtains, the AadBy measuring core sample
Nuclear magnetic resonance T after displacement2Spectrum obtains；
The core sample samples self-evaluation area target zone；
Nuclear magnetic resonance T before core sample displacement and after displacement2Determination step include：
Persistent pressure 48 hours under 30MPa displacement pressure keep core sample saturation simulation oily, to measure core sample drive
For preceding nuclear magnetic resonance T2Spectrum；
It is replaced simulation oil 48 hours under 30MPa displacement pressure with manganese water drive, so that core sample is saturated manganese water, to measure rock core
Nuclear magnetic resonance T after sample displacement2Spectrum；Mn in the manganese water2+Concentration is greater than 20000ppm.
It will be appreciated by those skilled in the art that specific displacement pressure and displacement can be selected according to practical Flooding Efficiency
Duration.
Embodiment 2：
The evaluation method of low porosity permeability sandstone reservoir moveable oil stock number as shown in Figure 1, includes the following steps：
(A) the oil-gas geology data of evaluation area's target zone are obtained, the oil-gas geology data include that oil area, reservoir have
Imitate thickness, reservoir porosity, reservoir permeability, oil saturation, oil density and oil volume factor；
(B) it is sampled in evaluation area target zone different depth, obtains at least two pieces of core samples, measure the core sample
The porosity and permeability of product；
(C) any one aforementioned low porosity permeability sandstone reservoir moveable oil ratio evaluation method of claim is used, rock core is measured
Sample moveable oil ratio；
(D) relation formula of three is established according to the porosity of core sample, permeability, moveable oil ratio, and by reservoir
Porosity, reservoir permeability bring relation formula into and reservoir moveable oil ratio are calculated；
(E) the moveable oil stock number of evaluation area's target zone is calculated according to reservoir moveable oil ratio；Wherein, the moveable oil
Stock number is calculated according to following formula：
Qm=S × H × Ф × So×ρo×Bo×Pm
Wherein, QmIndicate moveable oil stock number, S indicates oil area, and H indicates that reservoir effective thickness, Ф indicate reservoir hole
Porosity, SoIndicate oil saturation, ρoIndicate oil density, BoIndicate oil volume factor, PmIndicate moveable oil ratio.It will step
Suddenly the reservoir moveable oil ratio that target zone is calculated in (D), which brings above-mentioned formula into, can calculate target zone moveable oil stock number
Qm。
The moveable oil RESERVE EVALUATION method can based on core sample before displacement and displacement after nuclear magnetic resonance T2Spectrum
Variation, establish the relation formula of moveable oil ratio and porosity, permeability, directly pass through common reservoir macroparameter：Storage
Layer porosity and reservoir permeability, are calculated the moveable oil ratio of reservoir, and then moveable oil stock number is calculated, without examining
Consider nuclear magnetic resonance T2Relaxation time cutoff value；Meanwhile core sample quantity collected can be adjusted according to actual needs, it is real
It is controllable to test cost, experimental period.
Embodiment 3：
In order to make it easy to understand, the sub- section V oil group of the selected high willow structural belt sand 33 of Nanpu Sag of Bohai Bay Basin is research purpose
Layer is carried out low porosity permeability sandstone reservoir moveable oil RESERVE EVALUATION, is included the following steps：
Step 1：The oil-gas geology data are collected, mainly include：Target zone oil-gas geology in area's to be evaluated as shown in Table 1
Data.
The sub- section V oil group oil-gas geology data of the high willow structural belt sand 33 of 1 Nanpu Sag of Bohai Bay Basin of table
Step 2：The sub- section V oil group rock core different depth position of research area sand 33 is sampled, core sample hole is measured
Degree and permeability, obtain the core sample of seven pieces of Different porosities and permeability size.
Step 3：Nuclear magnetic resonance T before measurement core sample displacement and after displacement2Spectrum：
It is 2.5cm that seven pieces of core samples, which are prepared into diameter, and length is the standard sample of 5cm, carries out washing oil；At 105 DEG C
At a temperature of, lasting drying is for 24 hours；Measure core sample porosity and permeability；In the environment of pressure is less than 0.098MPa, to rock
Heart sample persistently vacuumizes for 24 hours；The persistent pressure 48h under 30MPa pressure keeps core sample saturation simulation oily, and the simulation oil is close
Degree is 820kg/m3, viscosity 4.9mm2/s(40℃)；Measure nuclear magnetic resonance letter of the core sample under saturation simulation oil condition
Number, nuclear magnetic resonance T of the core sample before displacement can be obtained2Spectrum；Under 30MPa displacement pressure, simulation oil is replaced with manganese water drive,
Continue 48h, core sample is made to be saturated manganese water, the Mn in the manganese water2+Concentration is greater than 20000ppm；Core sample is measured in saturation manganese
Nuclear magnetic resonance T of the core sample after displacement can be obtained in NMR signal under water state2Spectrum, seven blocks of core samples
The nuclear magnetic resonance T of product2Spectrum is as shown in Figure 2.
Step 4：Calculate the moveable oil ratio of the low porosity permeability sandstone reservoir cores sample.
The formula for calculating the moveable oil ratio of the low porosity permeability sandstone reservoir cores sample is as follows：
Pm i=(Abd i-Aad i)/Abd i
Wherein, Pm iIndicate the moveable oil ratio of i-th of core sample, unit %, Abd iIndicate that i-th of core sample drives
Nuclear magnetic resonance T before replacing2The integral area of spectrum, dimensionless, Aad iNuclear magnetic resonance T after indicating i-th of core sample displacement2Spectrum
Integral area, dimensionless.
Step 5：As shown in figure 3, utilizing Matlab according to the porosity of each core sample, permeability and moveable oil ratio
Software carries out data analysis, and fitting obtains the relation formula of moveable oil ratio and porosity, permeability, obtains relation formula such as
Under：
Wherein, PmIndicate moveable oil ratio, unit %；K indicates permeability, unit mD；Indicate porosity, unit
For %.Bringing reservoir porosity, the reservoir permeability in the oil-gas geology data of target zone into above formula, that reservoir is calculated is movable
Oily ratio.
Step 6：According to the oil-gas geology data packet for the reservoir moveable oil ratio and target zone being calculated in step 5
It includes：Oil area, reservoir effective thickness, reservoir porosity, oil saturation, oil density and oil volume factor, such as 1 institute of table
Show, target zone moveable oil stock number in area's to be evaluated is calculated, as shown in table 2.Calculation formula is as follows：
Qm=S × H × Ф × So×ρo×Bo×Pm
Wherein, QmIndicate moveable oil stock number, unit t；S indicates oil area, unit km2；H indicates that reservoir is effective
Thickness, unit m；Ф indicates reservoir porosity, unit %；SoIndicate oil saturation, unit %；ρoIndicate that crude oil is close
Degree, unit t/m3；BoIndicate oil volume factor, dimensionless；PmIndicate moveable oil ratio, unit %.Step 5 is fallen into a trap
Obtained reservoir moveable oil ratio, which is brought into, can calculate moveable oil stock number in the calculation formula of moveable oil stock number.
The sub- section V oil group moveable oil stock number of the high willow structural belt sand 33 of 2 Nan Bao of table recess
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (5)
1. low porosity permeability sandstone reservoir moveable oil ratio evaluation method, which is characterized in that the moveable oil ratio is according to following formula
It calculates：
Pm=(Abd-Aad)/Abd
Wherein, PmFor moveable oil ratio, AbdFor the nuclear magnetic resonance T before core sample displacement2The integral area of spectrum, AadFor core sample
Nuclear magnetic resonance T after product displacement2The integral area of spectrum；
The AbdPass through the nuclear magnetic resonance T before measurement core sample displacement2Spectrum obtains, the AadBy measuring core sample displacement
Nuclear magnetic resonance T afterwards2Spectrum obtains；
The core sample samples self-evaluation area target zone.
2. low porosity permeability sandstone reservoir moveable oil ratio evaluation method according to claim 1, which is characterized in that core sample
Nuclear magnetic resonance T before displacement and after displacement2The determination step of spectrum includes：
Pressurization keeps core sample saturation simulation oily, to measure nuclear magnetic resonance T before core sample displacement2Spectrum；
Core sample is set to be saturated manganese water for simulation oil with manganese water drive, to measure the nuclear magnetic resonance T after core sample displacement2Spectrum.
3. low porosity permeability sandstone reservoir moveable oil ratio evaluation method according to claim 2, which is characterized in that the manganese water
In Mn2+Concentration is greater than 20000ppm.
4. the evaluation method of low porosity permeability sandstone reservoir moveable oil stock number, which is characterized in that include the following steps：
(A) the oil-gas geology data of evaluation area's target zone are obtained, the oil-gas geology data include that oil area, reservoir are effectively thick
Degree, reservoir porosity, reservoir permeability, oil saturation, oil density and oil volume factor；
(B) it is sampled in evaluation area target zone different depth, obtains at least two pieces of core samples, measure the core sample
Porosity and permeability；
(C) low porosity permeability sandstone reservoir moveable oil ratio evaluation method according to any one of claims 1 to 3 is used, rock is measured
Heart sample moveable oil ratio；
(D) relation formula of three is established according to the porosity of core sample, permeability, moveable oil ratio, and by reservoir pore space
Degree, reservoir permeability bring relation formula into and reservoir moveable oil ratio are calculated；
(E) the moveable oil stock number of evaluation area's target zone is calculated according to reservoir moveable oil ratio.
5. the evaluation method of low porosity permeability sandstone reservoir moveable oil stock number according to claim 4, which is characterized in that described
Moveable oil stock number is calculated according to following formula：
Qm=S × H × Ф × So×ρo×Bo×Pm
Wherein, QmIndicating moveable oil stock number, S indicates oil area, and H indicates that reservoir effective thickness, Ф indicate reservoir porosity,
SoIndicate oil saturation, ρoIndicate oil density, BoIndicate oil volume factor, PmIndicate moveable oil ratio.
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